Safer fail-through for Responses that come back null
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Allow NULL_RESPONSES to be passed back to fragments; fragments are ready to handle these responses properly.
Adding framework for App specific exceptions.
Merge pull request #51 from pkillian/issue-50_null-username-page-crash

Issue 50 :: Framework for NULL_RESPONSES fixes issue #50
BREAKFIX: Crashlytics keys caused null pointers
Merge pull request #52 from pkillian/break-fix-crashlytics-keys

BREAKFIX: Crashlytics keys caused null pointers